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UNITED STATES PATENT OFFICE.

cHARLES CAMPBELL, or WATERTOWN, NEW YORK, ASSIGNOR TO THE BAGLEY &SEWALL COMPANY, OF SAME PLACE.

BED-MOTION FOR CYLINDER PRINTING-MACHINES.

SPECIFICATION forming part of Letters Patent No; 379,933, dated March27., 1888.

- Application filed August 19, 1887. Serial No. 241,350. No'modeL) Toall whom it may concern:

Be it known that I, CHARLES H. CAMPBELL, of Watertown, in the county ofJefferson, in the State of New York, have invented new and usefulImprovements in Bed-Motions for Cylinder Printing-Machines, of which thefollowing, taken in connection with the accompany ing drawings, is afull, clear, and exact de scription.

This invention relates to the class of printing-presses in which thetype or form is carried on a reciprocating bed under animpressioncylinder which carries the sheets to be imprinted, and eitheroscillates or rotates con- [5 tinuously in one direction, and movessynchronously with the bed during the period of imprinting the sheet.

My invention has special reference to the reversing of the motion of thebed at the ends of its strokes. This has hitherto been effected byordinary devices which acted alike at both ends of the stroke of the bedand reversed the movements thereof with equal velocities. This has beenfound to be objectionable for the following reasons:

In the operation of the press the press-bed passes from the back end(which is the end from which the paper is fed)'to the front end, atwhich the ink -fountain .is located, and

while reversing atthis latter end the bed has to overcome the resistancedue to the labor of driving the ink-rollers, which it traversessuccessively until all of said rollers are acted upon by the bed. Thisgradually-increasing resistance to the movement of the bed causes saidmovement to easily reverse at the front end of the press.

In moving toward the back end of the press the resistance due to theinkrollers diminishes;

0 but before the bed is entirely relieved from said resistance the formcarried on the bed comes incontact with theimpression-cy linder toimprint the paper carried on said cylinder, I

the aforesaid resistance and the consequentthrust of the bed to thepoint of the reversal of its movement. ticeable by the wear of the partsand by the This result isplainly noadapted to transmit motion to thepressbed, 6

and a swinging arm having at its free end a gear engaging a rack anddriven from a suitable gear concentric with the axis of oscillation ofthe arm, all as hereinafter more fully described, and specifically setforth in the claim.

In the annexed drawings, Figure 1 is a side elevation of apress-bed-reversing mechanism embodying my invention. Fig. 2is an endview of the same. Fig. 3 is a side elevation ofa modification of myinvention, and Figs. 4 7 5 and 5 represent diagrams illustrating theeffect of my invention.

Similar letters of reference indicate corresponding parts.

F denotes a shaft journaledin suitable bear- 8o ings on the press frame,and having secured to it the mangle-wheel G, which has projecting fromits Side the segmental rack G,arranged concentric with said wheel, inthe usual manner. Said rack may be either formed of a series of pins, aa a. projecting from the side of the wheel G, and sustained at theirouter ends by a strap, b, as shown in'Figs. 1 and 2 of the drawings, orconsist of a segmental plate secured to the side of the aforesaid wheel,and 0 provided with the cogs along its edges,as shown in Fig. 3 ofthedrawings. semicircular guides d d are secured to the wheel G, concentricwith the last teeth at the ends of the rack G, for

the purpose hereinafter explained. From'the 5 wheel, H, secured to theshaft F, and, if derack than at the opposite end thereof. This 6 sired,an intermediate pinion, 0, may be arranged to transmit motion fromeither of the aforesaid wheels to the rack, as represented in dottedlines in Fig. l of the drawings and in full lines in Fig. 2 of thedrawings.

A represents the drivingshaft of the reversing mechanism, said shaftbeing supported in suitable bearings secured to the press-frame andhaving pivoted to it swinging arm E. To

the said driving-shaft, at one side of the arm.

E, is also rigidly attached a pinion, P, and on the free end of the armE is journaled a short shaft, 0, which is parallel with the drivingshaftA, and has secured to one of its ends either a star-wheel or a pinion,f, engaging the rack G. To the opposite end of the shaft 6 is rigidlyattached a pinion, P, which receives motion from the pinion P by anintermediate pinion, P, pivotedv to a stud-pin which projects from theside of the arm, as represented in Fig. l of the drawings; but I do notlimit myself specifically to the aforesaid means of transmitting motionfrom the driving-shaft A to the star-wheel or pinion f, inasmuch as thesame effect can be produced by various other meansas, for instance, bythe employment of sprocket-wheels in lieu of the pinions P P and adrive-chain connecting said wheel, or by attaching to the drivingshaft Aand shaft e miter pinions meshing with corresponding pinions on the endsof a shaft journaled in bearings on the side of the arm E, asillustrated in Fig. 3 of the drawings.

The arm E swings between two stops, h h, which limit the movementthereof, so as to maintain the pinion or star-wheel fin engagement withthe rack G. A roller, l, is pivoted on the side of the star-wheel f, andadapted to travel through. the segmental spaces between the ends oftherack and adjacent guides d d.

The operation of the described reversing mechanism is as follows: Thedrivingshaft A, rotating in the direction indicated by an arrow in Fig.1 of the drawings, imparts rotary motion to the pinion or star-wheelf.Through the medium of the pinions P P, or their desired de scribedequivalents, and the aforesaid starwheel f, oscillatory motion isimparted to the mangle-wheel. As the said wheel f approaches the end ofthe rack G, the roller Z encounters the semicircular guide (1, and intraveling along the said guide it maintains the star-wheel f inengagement with the last pin or tooth on the end of the rack and causessaid star-wheel to travel from one side of the rack to the other,

latter efi'ect is illustrated in Figs. 4 and 5 of the drawings. When therack represented by the line G in Fig. 4 of the drawings is with itslast teeth in the position indicated by the small circles o 0, the arm Ebegins to swing outward and carries the wheel f from the position shownby the circle f to the position of the circle f and in this movement theaxis of the wheelf moves in the line of the are a: x, and as the wheelpasses the position indicated by the circle said wheel compels the rackto continue its previous movement to a distance equal to the I versedsine s of the aforesaid are before the reverse movement of the rackbegins, and consequently said reverse movement is rendered more sudden.When the rack G is with its last teeth in the position represented bythe small circles 0 0. in Fig. 5 of the drawings, the arm E begins toswing inward and carries the wheel f from the position indicated by thecircle f to the position of the circlef, and in this movement the motionof the rack ispartially chccked,owing to the wheel 7 being carried inopposite direction from the movement of the rack a distance equal to theversed sine s of the are a: x,- hence the reversing of the movement ofthe rack is rendered more easy.

The relative position of the press-bed to the reversing mechanismdetermines whether the wheel G' is to be geared direct to the bed orwhether motion is to be transmitted from the said wheel to the bed by anintermediate gear. made with the view of bringing the quicker action ofthe reversing mechanism to operate on the pressbed when in its forwardposition and least resisted in its movement.

Having described my invention,whatI claim as new, and desire to secureby Letters Patent,

In combination with the reciprocating pressbed and mangle-wheel, the armE, pivoted at one end and carrying on its free end a pinion orstar-wheel engaging the mangle-wheel, a pinion secured to the shaft ofthe aforesaid pinion or star-wheel, a driving-pinion concentric with thepivot of said arm, intermediate gears pivoted to the arm and arranged totransmit motion to the pinion or star-wheel on the free end of the arm,and stops h h at opposite sides of the free end of the arm,substantially as described and shown.

In testimony whereof I have hereunto signed my name, in the presence oftwo witnesses, at Watertown, in the county of Jeflerson, in the State ofNew York, this 29th day of July, 1887.

CHARLES H. CAMPBELL. (L. 8.]

The arrangement of said parts is to be.

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